Adaptive Coding and Modulation with LDPC Codes and MMSE SNR Estimation for Mobile Wimax

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Adaptive Coding and Modulation (ACM) is a technique to improve the performance of wireless communication system by matching of the modulation, coding and other signal parameters to the state of channel. Recently, ACM has gained attentions of almost all future communication systems, especially Orthogonal Frequency Division Multiplexing (OFDM) systems. In essence, ACM allows the system to operate with maximum throughput while satisfying certain criteria. In other words, this is constrained optimization problem. In this paper, a similar problem is investigated in an ACM-OFDM system over Additive White Gaussian Noise (AWGN) channel and Fading channel.